** Storage capacity expansion** When the storage capacity on Synology 1U Rack Station reaches its limit, Synology expansion unit RX418 provides easy capacity expansion by adding 4 3.5"/2.5" SATA drives to the system. Synology RX418 can also be used as a dedicated local backup destination of Synology 1U Rack Station for comprehensive data protection. ** Reliable plug-&-play design** Simply connect Synology RX418 to corresponding Synology Rack Station & it is ready to use. Drives in the connected Synology RX418 operate as though they were internal to the connected Synology NAS & can be managed directly by Synology Disk Station Manager (DSM), with no additional software installation required. ** Green & easy to manage** Award-winning Synology DSM provides an intuitive user interface for easy system management. Drive hibernation can be configured in DSM to take effect automatically when the system has been inactive for a period of time. This not only saves energy but also extends the lifespan of the installed drives. **8TB (4 x 2TB) WD Gold Hard Drives Included**